Method and apparatus for making hollow articles



Feb. 16 1926.

E. J. KRoVEGER METHOD AND APPARATUS FOR MAKING HOLLOW ARTICLESy Filed Marsh 25. 1922 5 sheets-sheet 1 e? Hi? Feb. 1e 192s. 1,573,497

E. J. KROEG ER METHOD AND APPARATUS FOR MAKING HOLLOW ARTICLS med March 25. 1922 5 shuts-sheet 2 `r"f`.

[nuez/Lm" N By H2?? Feb. 16 1926. 1,573,497

E. J. KRQEGER METHOD AND APPARATUS FOR MAKING HOLLOW ARTICLES Filed March 25. 1922 5 Shgts-Shggt 5 fnUenZLo/r' Edw. Kroe er.

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Feb. 16 |926. 1,573,497

E. J. KROEGER ETI-10D AND APPARATUS FOR MAKING HOLLOW ARTICLES Filed March 25. 1922 5 Sheets-Sheet 4 In Uenfr Edw. JKr'oe er:

Feb. 16 1926. 1,573,497

E. J. Knol-:GER

METHOD AND APPARATUS FOR MAKING HOLLOW ARTICLES Filed March 25. 1922 5 Sheets-Sheet 5 20 of a multip Patented F eb. 16, 1926.

UNITED STATES PATENT OFFICE.

EDWIN J'. KROEGEB, OF AKRON, OHIO, ASSIGNOR TO THE B. F. Goonmcn COMPANY,

l' NEW YORK, N. Y., A CORPORATION OF NEW YORK.

Application led March 25, 1922. Serial No. 546,670.

To all (whom t may concern:

. Be it known that I, EDWIN J. KROEGER, a

citizen of the United States,V residing at Akron, in the county of Summit and State of Ohio, have invented a certain new and useful Method and Apparatus for Making Hollow Articles, of which the following is a specification.

This invention relates to the art of making hollow articles from plastic material, as in the case of molding battery jars from a vulcanizable rubber compound, and its chief objects are to provide an improved and rapid method of making such articles and nnproved apparatus for forming and molding the same.

.More specific objects are to provide a. method adapted to-Y produce substantially even heatin and vulcanization of all parts Fe-celled container, including the .partition walls thereof, which latter, under methods heretofore used, have been heated less rapidly than the side walls of the container, and to provide a method and apparatus adapted to save labor by facilitating the removal of the article, after vulcanizetion, from the mandrel or mandrels on which it is vulcanized.

f the accompanying drawings: x

Fig.V 1 is an elevation, with parts broken away and parts in section, of apparatus embodying and adapted to carry out my invention.

Fig. 2 is an elevation of the same, as viewed from the right of Fig. 1, with parts in section.

Fig. 3 is a plan view of a part of the apparatus represented by the line 3 3 in Fig. 1, .with parts broken away and sectioned.

Fig. 4 is a section on line 4--4 of Fig. 1.

Fig. 5 is a plan View of the principal parts of the apparatus with the mandrels in workreoeiving relation. l

Fig. (iis a fragmentary plan View of a vulcanizing press with the work therein.

Fig. 7 is a side elevation, on a large scale, of the molding device.

i Fig. 8 is a horizontal section, on line 8-8 of Fig. 7 the mold being slightly open.

Fig, 9 is a perspective view rof a mold member.

Fig. 10 is an elevation of a modification.

Fig. 11 is an elevation of parts of said llodification as viewed from the right of Referring to the drawings, 10 represents generally a hot-platen press, and preferably a plurality of such presses are arranged in a row. 1l, 1l are the rails of a track running past said press or presses, and 12 represents generally a car mounted on said track and supporting" apparatus presently to be described. A

Secured to the lower face of the upper, fixed platen 13 of the press 10 is a mold member 14. formed centrally with a molding face 15 for one side of the work, here represented as a three-celled battery jar 16, and on three sides of said molding face said mold member is formed with plane, inner, wed ing faces sloping outwardly from the wor the one of sald wedgin faces at the base of the jar being shown at 1 (Fig. 1). A mold member 18 of like form, inverted, is similarly mounted onthe lower platen 19 of the press, two of its'three wedging faces being shown at 17, 17* (Figs. 1 and 8). Between the mold members 14, 18 are provided a pair of wed eable, L-shaped mold or lining members a apted to be wedged inward, against the action of springs 20 presently to bedescribed, by the sloping, wedging faces such as the faces 17 and 17 of the mold members 14, 18, when the pressis closed, to press the two vertical side faces and the bottom face of the jar, one of said wedgeable mold members, each of which is adapted to press half of the bottom face and the adjacent vertical side faces of the jar, being shown at 20 (Figs. 1, 8 and 9). 18, 18 are dowel pins mounted on the lower mold member 18 and adapted to enter 'holes 18", 18" in the upper mold member 14 to insure accurate registry of said mold members. D For automatically withdrawing the wedgeable mold members 2()4 from the work when the press is opened, to permit the removal of the molded jar and the insertion of another jar to be molded, 'said members are` provided with stud-bolts 20?, 20 projecting therefrom through slots 20, 20b at the' partin plane ofthe mold' (Figs. 7 and 8), at the sides and rear end of the latter,each of said stud bolts extending through the ends of links, 20, 20, the opposite ends of which are pivoted to the upper mold member 14. 20d, 20l are links pivoted on the lower mold niembei' 18, their slotted ends being mounted on the stud-bolts 20n and overlapping the'links 209. 20, 20 are helical compressions rings mounted on the outer ends of said stu bolts between retaining nuts thereon and the links 20d. Said springs are adapted, upon the opening of the press to draw the stud bolts through the links 2()d and 20, the latter bearing at their ends against the outer faces of the mold sections, to retract the wedgeable mold members 20 from the work, the wedging faces 17 of the lower mold member being relieved of the wei ht of said wedgeable mold members by the inks 20, which links also assist the springs by swinging the wedgeable members awa from the work by gravity and also bythe orce of the opening press, on occasion, as in case the lining meiners 20 stick to the work, each air of the links 20, 20l constituting a togg e which is straightened by the descent of the lower press platen 19, the slots in the ends of the links 20l being of such length as to limit the opening movement of the press and thus prevent the links 20 from ssing off the side face of the lower mol member and possibly jamming against said member upon the subsequent closin of the press.

The wedgeable me d members 20 may be formed with overflow grooves, as shown at 20x, (Figs. 8 and 9).

For molding the cells in the jar I provide one or more mandi-els 21, 21,' here shown as three, each mandrel being hollow and formed with a steam inlet passage 22 and an outlet passage 23 therein for heating the mandrel, said passages respectively leading into and out o a series of connected steam chambers Eig. 5). Said chambers, for convenience o construction, preferably are provided as shown, by a series of arallel recesses 24, 25, 26 bored latera y into the mandrel and closed by' screw-plu s 24, 25,y 26, respective end portions o adjacent chambers being connected by passages 27, 27,

which passages, when positioned obli uely, as shown, may conveniently be bored, by access from the mouths of the recesses 24, 25, 26 before the screw plugs 24, 25, 26l are inserted. Each of the recesses or chambers except the last of the series, 26, is centrally divided by a partition member or disc, 28, secured to a post 29, said post being clamped between the screw-plugs 24I` or 25* and the bottom of the recess, to hold said disc in position to divide the recess into two compartments, or chambers, 24", 25x, 24', 25, as is clearly shown in Fig. 5. .The chambers as there shown are thus adapted to provide an effective circulation v of steam through the mandrel, the steam passing from the passage 22, through the adjacent compartments 24", 25x to the chamber 26, from whiclrit returns through the compartments 251, 24lr to the outlet passage 23. flexible hose for supplying steam to the passage 22 is rcvided for each mandrel, one of the same eing shown at 22", (Fig. 6), and a pet cock 23* is provided at the extremity of the passage 23 for venting the air from each mandrel. h:l'he mandrels heie shown are formed with t usual grooves 30, 30 at their work-engaging extremities for moldin porting ribs on the inner face 0% of the battery jar.

Attheir extremities farthest from their work-receiving ends, the mandrels 2l are c0- axially pivoted on a vertical, quickly-removable clevis-pin 31, between the arms of a forked mandrel-supporting and 'pulling bracket-member 32, on the car 12, said arms being suiiciently spaced apart to permit, on occasion, a vertical slidin movement of the mandrels on said pin. he middle one of late-supt c bottom the three mandrels here shown is formed on its upper and lower faces respectively with transverse :ribs 21 interfittin in the adjacent mandrels w en the three mandrels are assembled in molding position, and said ribs are adapted to hold the workreceivin portions of the mandrels a art for the app ication of stock thereto w en the mandrels are slid apart upon the clevis-p'in 31 and swung apart fan-wise on said pin as shownin Fig. 5, the ribs 21* then being out of registry with their slots in the adjacent mandrels. f

The mandrels are so cut away on their ad- ]acent faces at their work-receiving ends as to accommodate the stock comprising the partition members of the battery jar, while throughout the rest of their area said faces abut each other or the vadjacent. faces of the mold members 14, 18, when the press is closed u on the mandrels, the mandrels thus being a apted to be held ve accurately in position with respect to eac other and to the ,mold members, so as to insure uniformitlj;` in the size and shape of the jars. 33 ig. 1 is a quickly-removable dowel-pin mounte in the assembled mandrels, which are formed with registerable a rtures 21", 21", therefor the ends of sai dowel-pin projecting above and below the mandrels and being adapted to enter holes 14, 18 in the respective mold members 14, 18, to hold the mandrels in position between the mold members against. the ressure of the L- shaped wedgeable mol -members 20 as the press is closed, at which time the mandrels may have been ydisconnected from the bracket member 32 by withdrawal of the clevis-pin 31. u

with grooves The mandrel-supporting and pulling ,A

laterally projectin track-ways 34, 34, formed with guideanges 34, 34 (F ig. 2), and is mounted between oppositely positioned sets of stud rollers 35, 35, journaled on upwardly extending forks of a turret member 36, and engaging the upper and lower faces of the track-Ways 34.

The bracket member 32 is formed on the under side with a rack 37, between and parallel with the track-ways 34, and 38 is a. drive-pinion meshed with said rack, said pinion being secured to a shaft 39 journaled in the forks of the turret member 36 and provided with a hand-wheel 40 for horizontally reciprocating the mandrel-supporting and pulling member 32.

For latching the bracket member 32 in lixed relation to the turret member 36, I provide a latch-bolt 41 slidably mounted in a sleeve 41 extending through ,one of the forks of the turret member 36 and adapted to be engaged in a. recess 42 (Fig. 4) formed in `sa1d bracket-member, said bolt being backed by a spring 43 (Fig. 4) and provided with a hand-knob 44 for retracting it to release said bracket member. The stem of said hand-knob is provided with a stop 44 fitting into a recess in the sleeve 41 when the bolt is in latching position, and adapted to bear against the end of said sleeve when the bolt is retracted and given a partial turn, to hold Said bolt out of latching position.

In a longitudinal `oove formed on the upper face of the brac {et-member 32 is slidably mounted a ratch 45 having at its end a presser foot 45 (Fig. 3) adapted to bear against the upper mold member 14 of the pressrl() to force the mandrel-supporting and pulling member 32 away from the press through the action of said ratch. For actuating said ratch I provide a horizontal handlever 46 fulcrumed at 47 on the bracketmember 32, at which point is also pivoted a retainin pawl 48 adapted to engage said ratch un er pressure of a spring-backed plunger 49 (Fig. 3) mounted in a'recess in the bracket member 32 and bearing against an extension or heel 50 of said pawl back of its plvot. A driving pawl 51 associated with said ratch is pivoted at 52 on the lever 46 and connected with the retaining pawl 48 by a lost-motion link 53` whereby it is adapted. on occasion` to be disengaged from the ratch along with the retaining-pawl 48 by means of a handle 54 extending from the latter pawl, although permitted by said lostmotion link to run on and engage the teeth of the ratch While the retainingawl 48 is engaged. 55 is a spring-backe ing the driving pawl 51 in engagement; with the handle 54, against the pressure of the plungerr4 mount-ed on the retalning pawl 48 for holdplunger 49. 56 is a cover plate for the parts just described, secured upon the bracket-member 32. For holding the ratch 45 in step with the pawls 48, 51, and for automatically retracting said ratch when the pawls are lifted therefrom by the handle 46, a pull spring 57 (Figs. 1 and 5) is mounted between. the rear end of the ratch and a post 58 rising from the bracket-member 32.

The member 36 is rotatably mounted upon a vertical post 59, said post being slidably mounted in a verticali guide-standard 60" upon the car 12 and splined against turning therein, as indicated at 61 (Fig. 1 For turning said member 36, and the racket member 32 and other parts carried thereby, and securing'them in different rotative positions` the member 36 is provided with a handlever62 having a sliding latch-pawl 63 (Fig. 1) associated with a ratchet member 64 secured upon the post 59. 65 is a ball-bearing between the member 36 and a shoulder provided by the ratchet-member 64. The post 59 is threaded for a distance below the ratchet-member 64, and 66 is a hand Wheel formed with a female-threaded hub, mounted upon the threaded part of said post and resting upon the upper end of the guide-standard 60, for raising and lowering said post. c

Clamped upon the upper end of the guldestandard 60 is a bracket 67, extending to the side of the car 12 opposite the press 10 and at its end supporting an open-sided box 68 adapted to contain stock and to support stock, tools or the mandrels 21 upon its roof.

For securingthe car 12 exactly in position in front of the press 10, said car is provided with a sliding, sprin -backed latchpawl 69, at each side, sai pawls being mounted in vertical guides 69, 69, secured to the car frame. Said pawls are adapted to engage in notches formed in the res ective rails` 11 and to be simultaneously ifted from sai notches` against their springs 69, by respective arms 70, 70 extendin from a rock-shaft 71 extending across t e car and mounted in the frame thereof, each arm 70 extending through a slot in the guide 69 and engaging a pin 69c (Fig. 2) mounted in the forked upper end of the paWl 69. For turning the rock-shaft 71 and holding the pawls 69 in or out of engagement with the notches in the rails 11, a hand lever 72 is secured to one end of said'rock-shaft and provided with the usual sliding, springbacked latch-pawl 73, coacting with a. segmental ratchet 74 secured to the frame of the car.

In the operation of the apparatus. assumf` mandrel-supporting and pulling member being connected with the mandrels 21 by the clevis-pin 31, the press is relieved of its compression and ma be sli htly opened but not so far opene as to c ear either o the mold 'members from the battery jar. The dowel pin 33 is then driven out, and the ratch 45 is forced against the .moldmember 14 by oscillating the hand-lever 46, to drive the bracketmember 32 away from the press and thereb loosen the mandrels V21 from the work. lf hen the mandrels have thus been st tur ed and, throlwh the inion 38 and rack 37, rapidly withdsraws t 1e mandrels from the press, from which latter the finished battery jar may then be removed upon the further opening of the press, at which time the L-shaped, wedgeable,J mold or lining members 20 are spread apart, by the links 20 and the springs 20", as above described, to receive the next jar between them.

The mandrels, beinguclear of the press, are carried by the member 32 -while-f the latterv is turned through half a revolution by means of the lever 62 Yand latched against further turning by the pawl 63, the mandrels then being over the box 68. While the mandrels are out of the press, battery jar stock is assembled upon them in substantially the form of the finished jar 16, the stock being suiiciently pressed by hand to cause it to retain its relation to the mandrels. This jar assemblin operation may be erformed by turning t e hand-wheelY 66 to ower the mandrels onto the box 68 on a sheet of side-wall stock laid thereon, sliding all but the lower mandrel u ward on the clevis-pin 31 and spreadingl t em fanwise as shown in Fig. 5, the r1 21l holding them spaced apart vertically, laying sheets of partition -stock upon the upper face of each of` the mandrels except the uppermost one, turnin them back together upon the pin 31 unt; the ribs 21 enter their grooves and permit the mandrels to n come together upon the partition stock, in-

serting strips o rib-formin stock in the grooves 30, and then applying the bottom stock to the assembled mandrels and foldin the side-wall stock around them.

he jar bein thus built'on lthe mandr'els, the turret-mem er 36 is turned back to present the mandrels to the press, into which they, with the newly-built jar upon them, are inserted by turnlng the hand wheel 40, the ratch 45 meanwhile having been released by the handle 54 and retracted by the sprin 57. The dowel pin 33 is then inserte through the mold members 14, 18

, and the mandrels, theclevis-pin 31 withdrawn, andg the press/ closed, wedging/the L-shaped mold or lining members 2O against the base andlthe t'ertical side faces of the jar. The latter is then vulcanized by steam ted, the hand-wheel 40 is' applied to the interior of the mandrels through the hose 22 and also to the platens 13 and 19. To facilitate the registering of the holes 21h of the mandrels with the holes 14, 18 of the mold members, and also to secure the member 32 in fixed relation to the turret member 36 after the mandrels have been pulled from a jar, the latch-bolt 41 may be permitted to enter holes, such as the hole 42, appropriately positioned in the member 32.

L When the mandrels have been inserted in the press and the member 32 has been disconnected from them by withdrawal of the `clevisin 31, the car-holding pawls 69 are lifted means of the lever 72 and the car is moved along the rails 11 to the next press, there to re eat the operation ot pulling the mandi-els rom said press and reinserting them with a new jar thereon. s

In the modification shown in Figs, 10 and 11, a table is provided adjacent the press i 10 for supporting the modified mandrels 21x, 21x, there shown diagrammatically, and 76 is an eye-bolt anchored in the end of the middle mandrel for pulling the mandrels from the vulcanized jar, the ribs 21* inter- Y. locking with the adjacent mandrels to compel the latter to move with the middle one. For exerting the pulling force upon the mandrels a traveling frame 77 is provided, said frame being suspended from an overhead track'78 and having at its lower end a pair of horizontal X-beams 79, 79 adapted to bear against the upper mold member 14 of the press 10, as clear] shown in Fig. 10. 80 is a load chain provi ed at one end with a hook 81 adapted to engage the eye of the bolt 76, saidn chain being mounted upon a guide pulley 82, journaled between the beams 79 at their rear ends, and upon a guide pulley 83 journaled nearer the middle of the frame, from which latter pulle said chain passes to a chain b1oek83, whie may be of any known or preferred construction, sus ended from the upper part of the frame an rovided with a hand-chain 84 for ullin t e load chain 80 with a large mec anica advantage, to withdraw the mandrels from the battery jars.

The travelin frame. 77 may be moved along the overead track 78 to successive presses to pull the mandrels from finished attery jars held therein, and the mandrels, with newly built, unvulcanized jars thereon, are re-inserted in the presses by hand.

`In making the jar by my method the vult pressure may be applied transversely to the entire outer surface of the jar, so that a minimum of excess stock and flow thereof is required to assure coalescing of the several parts of the jar. The removal of the mandrels from the jar is accomplished rapidly and with a minimum of handling, so that time and labor are saved and breakage of jars is avoided, the jar, during the mandrelpulling o erations being held in position by the mol surfaces against which it was molded and with which it snugly lits.

The employment of the lining members 20 in the mold, together with means for appropriately moving them with relation to the mold, permits ready and, if necessary, l,forcible, dislodgment of all external molding members from the Work, and at the same time provides for their ready reassembly in molding relation.

Further modifications may be resorted to Without departing from the scope of my invention, and I do not Wholly limit my claims to the particular embodiment thereof here shown.

I claim:

l. The method of making a multiplecelled container from plastic material which comprises assembling partitionl-forming sheets of said material in spaced relation, applying side-wall and bottom-forming sheets of said material to said assembled partition-formin sheets, and applying heat to the container t us assembled, from a heating medium circulated through the cells thereof, While ap lying molding pressure to the partitions, si e walls and bottom ofsaid container, A

2. The method of making a container consisting of a hardening plastic which comprises molding the container upon a mandrel y molding pressure applied transversely of its height, causing the plastic material of the container to harden, and withdrawing the mandrel while holding the container by interlocked engagement thereof with the transverse-preSsure-applying means.

3. Apparatus for molding a multiplecelled container, said ap aratus comprising a set of mandrels adapted) to be assembled alternately with sheets of partition-forming stock and t'o abut each other outside of the container while accommodating the partitions thereof betweentheir Work-'receiving ends, means for applying external molding pressure to a container with said mandrels and pressing said mandrels together, and means for internally heating the Work-engagin ends of said mandrels.

4. Ign apparatus for molding a multiplecelled container, the combination of a set of hollow mandrels adapted to be assembled alternately with sheets of partition-forming material, means for applying external mold-4 ing pressure to a container assembled with,

said mandrels, and means for circulating a heating fluid through the interiors of said hollow mandrels.

5. In apparatus for making a hollow article from plastic material, the combination of a mandrel for internally molding the article, means for internall heating said mandrel, a pair of outer mol members adapted to press outer side faces of the article and a pair of L-shaped mold members adapted to be forced against the article by said pair of outer mold members to press side faces and an enclosed end of the article.

6. In apparatus for making a hollow article from plastic material, the combination of a mandrel lfor internally molding the article, means for internally heating said mandrel, an outer mold member, means for forcing said outer mold member against a side Wall of an article mounted on said mandrel, a mold member adapted to be forced by the first said mold member against the bottoni of said article, and a dowel member adapted to hold said first mold member and said mandrel against relative movement under pressure of said second mold member.

7. In apparatus of the character described, the combination of a fixed mold member, movable mold members associated therewith, and a mandrel pulling device adjacent said fixed mold member and including a movable member positionable thereagainst and adapted to coact therewith to force the mandrel therefrom.

8. In apparatus of the character described, the combination of a lurality of platcnapresses, a pair of mold members mount on the platens of each press, and a mobile mandrel manipulating device positionable adjacent the several presses.

9. In apparatus of the character described, the combination of a press, a track adjacent said press, a car mounted on said track, a turret member mounted on said car, and a mandrel manipulating device mounted on said turret.

10. In apparatus for making a multiplecelled container, a set of mandrels adapted to be assembled alternately with partitionforming sheets of stock, said mandrels being adapted to abut each other outside of a container formed thereon while accommodating said partition-forming sheets between their Work-receiving portions, and interlocking means lying wholly within the combineddi- Vmensions of the assembled mandrels for registering them With each other and preventing their separate removal from the Work.

11. In apparatus for making a multiplecelled contamer, a set of mandrels adapted to be assembled alternately with partitionforming sheets of stock, adjacent mandrels being formed respectively with a recess and aprojection adapted to enter said recess to hold said mandrels in re istry, and a pivotal mountin for said man rels, said mandrels being slidably mounted thereon, and said pro'ection being adapted to hold said mandreis apart when the latter are turned out of registry -upo said pivotal mounting.

12. In an apparatus of the character described, the combination of a platen press, a mold member mounted upon a platen of said press a mandrel pulling member adjacent sai press, a ratch slidably mounted on said pulling member, and a lever pivoted on said pulling member for actuating said ratch.

13. In apparatus of the character described, the combination of a press, a turretmember adjacent said press, a, mandrel manipulating member mounted on said tur- 'ret member, and a rack-and-pinion mechanism `for moving said mandrel manipulating member relatively to said turret4 member.

14. In apparatus of the character described, the combination of a press, a turretmember adjacent said press, a mandrel pulling and supporting member movabl mounted on said turret member, a rack-an pinion mechanism for moving said mandrel pulling member relatively to said turret member and a lever mechanism ada ted to start said pulling member from sai press.

15. In apparatus ofv the character described, tlie combination of a press, a mandrel manipulating member adjacent said ress, said member bein formed with a ork, a clevis-pin detachab y mounted in the arms' of said fork, and a set of mandrels pivoted on said clevis-pin, said mandrels eing adapted to be assembled alternately with/sheets of stock and to be slid and turned away from each other on said pin to receive said stock. .v

16. In apparatus `of the character described, the combination of a press, a track l adjacent said ress, a car mounted on said track, a rotata le member mounted on said car, a mandrel manipulating member movabl mounted u n said rotatable member, an a latch mem er for securing said manipulating member and said rotatable member in fixed relative positions.

17. In apparatus of the character described, the combination of a` press, a track adjacent said press, a car mounted on said track, a rotatable member mounted on said car, a mandrel manipulating member movabl mounted upon said rotatable member, an means for raising and lowerin said rotatable member with respect to said car.

1,8. In apparatus of the character described, the combination of a press, a track adjacent said ress, a car mounted on said track, a rotata le member mounted on sai'd car, a mandrel manipulating member movably mounted upon said rotatable' member, a threaded vertical post supporting .said

rotatable member, said post bein slidably and non-rotatably mounted on sai car, and a hand wheel formed with a female-threaded hub mounted on the threaded part of said post for raising and lowering the latter.

19. In apparatus of the character described, the combination of a press, a track adjacent said press, a car mounted on said track, a rotatable member mounted on said car, a mandrel manipulating membermovably mounted upon said rotatable member,`

post for raising and lowering' the latter, a'

pawl-lever secured to said rotatable member and a ratchet secured to said post for turning said rotatable member and securing it in different rotative positions.

21. In apparatus of the character described, the combination of a press, a track adjacent said press, a car mounted on said track, a mandrel manipulatin i device mounted on said car, and a paw member mounted on said car and adapted to bear against a fixed -part of said track to secure said car against movement thereon.

22. In apparatus of the character described, the combination of a press, a track adjacent said ress, a car mounted on said track, a rotata le member mounted on said car, a mandrel manipulating member movably mounted upon said rotatable member, and a work-sup orting member mounted on said car and a Japted to receive a mandrel mounted on said mandrel manipulating member. J

23. In apparatus for making a hollow article from plastic material, the combination of a mandrel for internall molding the article, a pair of outer mol members adapted to press outer side faces of the article, wedgeable mold members adapted to be wedged against other faces of said article by sai outer, mold members, and yieldin means, opposed to such movement of sai wedgeable mold members, for retracting them when said outer mold members are retracted.

2 4. In apparatus for making a hollow article from plastic material, the combination-'ot a mandreljor internally molding the article, an upper mold member,1a lower mold member, a air of L-shaped wedgeable mold members `a apted to be wedged against the Work by said upper and lower mold members and having stud-bolts projecting to the exterior ofsaid upper mold memger, links pivoted to said upper mold memer slidably mounted on said stud bolts, so as to act as supports for said wedgeable mold members, and springs interposed o eratively between said links and said stud olts for urging said wedgeable m-old members away from the work.

25. In apparatus of the character described, a mandrel formed with adjacent recesses from the opposite faces thereof and with `a plurality of apertures connecting said recesses, a partition member secured in one of said recesses between said apertures, and closure members threaded into said recesses. f

26. Apparatus for making a multiplecelled container from plastic material, said apparatus comprisin a set of mandrels adapted to be assem led alternately with partition-forming sheets f material, means for internally heating said mandrels, and means for simultaneously applying direct, transverse pressure to substantially the entire side walls and bottom of a container assembled on said mandrels.

27. In apparatus of the character described, the combination of a press, a turretmember adjacent said press, and a mandrel manipu ating and supporting member mounted on said turret member.

28. In molding and vulcanizing apparatus the combmation of a mold, a plurality of separable lining members inthe mold having extensive, heat conductive, face-to-face contact therewith, an internal molding member, power actuated means for exerting molding pressure on the mold,

and having apertured lower ends the lining members ber, saidexternal mold structure comprising a plurality of external side-shaping members and a backing therefor, means for forcing relative movement 4of the external side-shaping members and the in` ternal moldin member to mold the articleI and means a apted to effect reverse relative movement thereof and concurrently to effect rela-tive movement of the external side-shaping members and their backing member,

30. In apparatus for -molding hollow articles the combination of an external mold structure and an internal molding mem ber, said external mold structure comprising a plurality of external sideshaping members having external faces oblique to their shaping faces anda complementally formed backing member slidably fitting said oblique faces 1n extensive, heatfconductive contact, means for circulating a heating fluid to heat the said backing member, and means adapted in a single movement there-V of to effect separation of the internal molding member andthe side-shaping -members and relative mb ement of t e latter and their backing m mber.

In witness whereof I have hereunto set my hand this 23 day of March,` 1922. L

EDWIN J. KROEGEB.

the work by said upper and lower mold members and having stud-bolts projecting to the exterior of said upper mold member, links pivoted to said upper mold member and having apertured lower ends slidably mounted on said stud bolts, so as to act as supports for said Wedgeable mold members, and springs interposed o eratively between said links and said stud olts for urging said wedgeable mold members away from the work.

25. In apparatus of the character described, a mandrel formed with adjacent recesses from the opposite faces thereof and with a plurality of apertures connecting said recesses, a partition member secured in one of said recesses between said apertures, and closure members threaded into said recesses. f

26. Apparatus for making a multiplecelled container from plastic material, said apparatus comprisin a set of mandrels adapted to be assem led alternately with artition-forming sheets of material, means or internall heating said mandrels, and means for simultaneously applying direct, transverse pressure to substantially the entire side walls and bottom of a container assembled on said mandrels.

27. In apparatus of the character described, the combination of a press, a turret-member adjacent said press, and a mandrel manipulating and supporting member mounted on said turret member.

28. In molding and vulcanizing apparatus the combination of a mold, a plurality of separable lining members in the mold having extensive, heat conductive, face-to-face contact therewith, an internal molding member, power actuated means for exerting molding pressure on the mold,

means for separatin the lining members and the internal mo ding members, means adapted as an incident of reverse movement of the said power actuated means to force relative movement to the mold and lining member, and means for subjecting the mold to vulcanizing heat.

29. In apparatus for molding hollow articles the combination of an external moi'l structure andan internal molding member, said'external mold structure comprising a plurality of external side-shaping members and a backing therefor, means for forcing relative movement `of the external side-shaping members and the internal molding member to mold the article, and means adapted to eect reverse relative movement thereof and concurrently to veffect relative movement of the external oblique faces in extensive, heat-conductive contact, means for circulating a heating fluid to heat the said backing member, and means adapted in a single movement thereof to effect separation of the internal molding member and the side-shaping members andA relative movement of the latter and their backing member.

In witness whereof I have hereunto set my hand this 23 day of March, 1922.

EDWIN J. KROEGER.

Certificate of Correction.

i '1t is hereby certified that in Letters Patent No. 1,573,493?, Y 1926, upon thea plication of Edwin J. `Kroegexgoi' Akron,

.Granted February 1G, hiofor an improvevnient in Metho s andApparatus for Making Hollow Articles, errors appear in the printed specification requiring correction as follows: Pa the yword container insert the word assembled; page 7 ji 5 line 56, claim 3, after ne 43, claim 28, for the word members read membemline 46,v for the word to read of; and line47, for the word member read members; and that the said Letters Patent should be road with these corrections therein that the same may conform to the record of the case in the Patent Oilice. Signed and sea-led fsmn] p y this 13th day of Apri-l, A. D. 1926;

M. J. MOORE, ArrivingV onwtssomr of Patents.

Certificate of Correction.

It is hereby certified that in Letters Patent No. 1,573,497, Granted February 16, 1926, upon the application of Edwin J. Kroeger, of Akron, (hiofor an improvement in Methods and Apparatus for Making Hollow Articles, errors Vappear 1n the printed specification requiring correction as follows: Page 5, line 56, claim 3, after the word container insert the word assembled; page 7, line 43, claim 28, for the word .Inembers read member;.line 46, for the word to read of; and line 47, forth@ Word member read members,- and that the said Letters Patent should be read with these corrections therein that the Same may conform to the record of the case in the Pute-nt Office. Y

Signed and sealed this 13th day of April, A. D. 1926;

[ma] M. J. MOORE,

Acting Commissioner of Patents. 

